Checklist
Room Painting Supplies Checklist
Everything to sort out before you open the first can of paint.
Tick items as you work through them. Nothing is saved — reloading or reopening this page starts a fresh copy. Print it if you need to keep your place.
Measure and estimate
Perimeter multiplied by height gives the gross wall area every paint estimate starts from. Measure rather than pace it out; a metre of error over four walls is a noticeable quantity of paint.
Openings are subtracted from the gross wall area. Unusually large openings, or a full-height window wall, are worth measuring directly instead of counting as standard units.
Coverage varies by product, surface texture, application method, and how big a colour change you are making. The manufacturer's own figure for the product you are buying is a better starting point than any generic number.
A large colour change, a patch-repaired wall, or new plasterboard may need more coats than a like-for-like refresh, depending on the product, primer, porosity, application, and acceptable finish. Check the label and a test area. Coats multiply the area, so this decision can change the quantity substantially.
Knowing the figure in advance is what lets you compare container sizes on price per litre or gallon rather than guessing at the shelf.
Check the surfaces
These change what the job is. Damp in particular has a cause that painting does not fix, and covering it can hide a problem that keeps spreading.
Let the repair material dry or set and reach the manufacturer's stated condition before sanding, priming, or painting. Ready-to-sand, ready-to-paint, and fully cured may describe different stages.
Paint needs something to bond to. Kitchen walls, skirting, and anywhere hands touch regularly are the usual places this matters.
Rules on disturbing older paint layers differ by country and by the date a property was built, and testing and handling requirements differ with them. In the United States, pre-1978 housing triggers specific lead guidance. Confirm what applies where you are before sanding or scraping rather than assuming a general rule.
Primer is a separate product from paint and is not included in a paint quantity estimate. Bare plaster, patch repairs, strong colour changes, and stained areas are the common cases; the paint's own instructions are the authority.
Protect the room
Clear access reduces the chance of spills and missed patches behind objects that would otherwise need to be moved during the job.
Use stable, non-slip protection and secure its edges so it cannot slide, curl, or create a trip hazard in walking and ladder areas.
Masking is usually the less disruptive choice, and it avoids the isolation question altogether. Electrical devices and openings are not painted.
Isolate the correct circuit and verify it is de-energized by an appropriate method, or use a qualified electrician. A wall switch is not proof and the breaker label may be wrong.
Use an inspected ladder of the correct type and rating on a firm, level, dry, unobstructed base, and follow its instructions. Do not use prohibited top steps or improvised platforms. Plan to move the ladder rather than overreach, and check that no door can swing into it.
Tools and setup
Roller nap and brush type are matched to the finish and the surface texture. A leftover roller from a previous job may be the wrong one for this paint.
Requirements differ between products. The container and its safety data sheet are the authority for this specific paint, not a general rule of thumb.
Poor light can hide missed areas and roller marks. Inspect with useful general and side lighting before deciding a surface is complete.
Ceiling before walls is a common sequence because later work can cover small edge marks, but it is not mandatory. Work in manageable cut-in and rolling sections to maintain the wet edge required by the coating, and follow its application and recoat instructions. The [room-painting order guide](/guides/best-order-to-paint-a-room/) covers why the sequence is what it is, and when it does not apply.
Before you open the can
Confirm the product, colour, finish, and quantity before opening it. A mismatch is easier to resolve while the container remains unopened and subject to the retailer's return policy.
Running out on a continuous surface increases the risk of a visible lap or batch difference. Compare your calculated requirement against what is actually in the room.
Containers can differ slightly. For identical, compatible product, colour, and sheen, the manufacturer may recommend combining enough containers in a suitably sized container for consistency. Keep labels and batch details, and follow product guidance.
How to use this checklist
Work down it in order. The first section decides how much paint to buy, which is a decision the rest of the job depends on. Finding a surface problem or quantity shortfall before the furniture is moved is easier than discovering it after work begins.
Nothing here is specific to a brand or a product. Where an item says to check the container or its safety data sheet, that is because the answer genuinely varies between products and the label is the authority for the one you bought.
Working out the quantity
The Paint Calculator takes the perimeter and wall height in feet, the opening counts, the coat count, and the container’s coverage in square feet per US gallon, and returns the gallons required and the number of whole one-gallon cans. There is no unit selector, so convert metric measurements before entering them — entered as metres they are read as feet, and the result silently reads zero. It estimates walls only — ceilings, trim, and doors use different products and are calculated separately. If you want the measuring steps in full, the room-measuring guide covers them.
Treat the result as a planning figure. Porous or textured surfaces, large colour changes, spills, and touch-ups can increase real usage, and how much depends on the walls, product, and application rather than on a fixed percentage.
Before disturbing an existing surface
Do not treat sanding and scraping as automatic preparation steps. The age and condition of the existing coating can change the safe approach. In the United States, work that disturbs paint in pre-1978 housing calls for lead-safe guidance; other jurisdictions use different dates and rules.
If the age or contents of a coating are unknown, pause before creating dust. Check the US Environmental Protection Agency’s lead-safe renovation guidance or the relevant local environmental or health authority. Contractors, rental properties, and child-occupied facilities may have obligations that do not apply in the same way to an owner working in their own home.
Match the plan to the selected products
The checklist deliberately avoids universal instructions for primer, ventilation, protective equipment, drying, and recoating. Those requirements vary by coating, substrate, application method, and conditions. Keep the container and safety data sheet available while planning and working.
Dry-to-touch, ready-to-recoat, and fully cured are different milestones. The same distinction applies to repair products: use the manufacturer’s stated ready-to-sand, ready-to-prime, or ready-to-paint condition instead of assuming full cure is required at every stage.
Finish names also vary across product ranges. Confirm the actual product and approved surface rather than assuming one brand’s satin, pearl, or eggshell behaves like another’s. The Interior Paint Finishes Explained guide covers that comparison in more detail.